Delete row sig_9087c4ff1f35 from signals

id sig_9087c4ff1f35
event_id evt_45d2b43c08f1
watcher_id NULL
signal_type discovery_unusual_volume_snapshot
value {"as_of":"2026-04-08T09:32:58.863475+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_rss
reason_trace {}
dedupe_key discovery_unusual_volume_snapshot:8cd8dee3bf35e760
throttle_s 0
created_at 2026-04-08T09:32:58.863475+00:00
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